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b. 12

composition: Op. 29, Impromptu in A♭ major

..

We add a cautionary natural next to f2 on the 4th quaver of the bar. The sign was added by someone else in A and put in GE.

category imprint: Differences between sources; Editorial revisions; Corrections & alterations

issues: GE revisions , Foreign hand additions in manuscripts , Cautionary accidentals

b. 12

composition: Op. 29, Impromptu in A♭ major

 
 
..

We add the fingering inscribed by Chopin into FES and FEJ in analogous bar 94.

category imprint: Editorial revisions

b. 12-13

composition: Op. 29, Impromptu in A♭ major

..

EE is lacking pedalling indications in those bar; the same applies to analogous bars 94-95. 
It may imply that Chopin added those indications already after all three edition manuscripts had been done, with exception of the manuscript dedicated to EEThe signs in A are written more delicately, which suggests that they were written in different time than the remaining indications.

category imprint: Differences between sources

b. 12

composition: Op. 29, Impromptu in A♭ major

..

EE and FE omitted the stem extending e on the 4th crotchet of the bar.

category imprint: Differences between sources

issues: Errors in FE , Errors in EE

b. 13

composition: Op. 29, Impromptu in A♭ major

..

We assign the ambiguous beginning of the slur in A to the 2nd quaver. It stems from the analysis of the way of writing slurs in the entire A ‒ see A's characteristic. In the editions the slur begins from the 1st quaver. In FE the notation is erroneous ‒ the beginning of the slur is placed too early, as if it continued the slur from the previous great stave.

category imprint: Graphic ambiguousness; Differences between sources

issues: Errors in FE